They can even use the stylus to mix two ability bubbles together to get a random ability bubble. But when Sword gets its copy scroll upgrade, the player can mix it with another ability to get a true combo ability (i.e. Sword+Fire or Spark or Ice). The same thing is true with Bomb (without Fire, though). Also, one of the methods of getting the Ghost ability is by mixing two Sleep bubbles, but only if Kirby obtains all the Ghost Medal pieces. There is even a Copy Ability called Bubble, where Kirby can turn his enemies into ability bubbles.